Generally, the starting (cut-in) wind speed of wind turbines is 2-3m/s;
The cut-out wind speed is 20-25m/s.
However, different wind speeds have different corresponding output powers, which are expressed according to the power curve of the unit. As shown in the figure below:
So, a 2 MW permanent magnet direct drive wind turbine requires 2-3m/s wind to operate.